I disagree with the other answer. I only have access to the english core rule book (is there even an Exxet for psionics?) so I cannot speak to the rules present in any other books. Page numbers refer to the printed page numbers in the english rules, and I will attempt to list headers where appropriate.
Activating Psychic Powers
In order to execute a psychic powers you roll a d100, and add Psychic Potential. Compare this to the difficulty table on the power.
- Chapter 13, pg.192 The use of Psychic Powers
Some powers can be maintained, and you need to put them in innate slots.
Innate slots allow the psychic to be subconsciously tie one of their Powers to their will so that they can be used effortlessly every turn (...) It is necessary for characters to use a Power once before they can keep it active.
Once the power is activated, you drop it into an innate slot, and
they will not need to roll any dice to use it
This power operates in the natural difficulty range of the characters Psychic Potential or the minimum activation level (because you have no roll to add to it)
- Chapter 13, pg.194 Acquiring an Innate Slot
You need to use Projection to hit enemies at range (Except for telepathic abilities, which expressly do not require a Projection roll)
- Chapter 13, pg.195 Psychic Projection
So we now have all the parts needed to know how to use our psychic abilities, and place them into innate slots! Here's a (simplified!) breakdown:
- Activate a power
- Roll Psychic Potential to see how well it works
- Choose whether to drop the ability into an innate slot
- (If applicable) Roll Projection to determine range
- Resolve the ability
This means that once you have activated a power successfully and dropped it into an innate slot, you are free to keep using that power as much as you like, with new Projection rolls whenever you want to use the ability on a new target, to whether the target is within range.
Let's apply this to Organic Psychokinesis:
- Activate Organic Psychokinesis
- Roll Potential to get a difficulty level
- Choose to drop into innate slot (dropping to minimum difficulty level, let's assume 120)
- Roll Projection to determine range (lets assume it worked! Your target is in range!)
- Target rolls PhR (assume they fail)
- Check weight limits (assume they're light)
- You can move the target at Flight Value 4!
- A new target appears
- Decide to target them with your innate power
- Roll Projection to determine range (assume they're in range)
- Target2 rolls PhR (assume they fail)
- Check weight limits (including target1, assume they're both light enough)
- You can move both targets with Flight Value 4!
Now, one aspect of this particular power is that we do not get a rate at which the PhR checks are made. This is up to interpretation by the GM, but I would rule that the targets get a new check each turn to resist being moved by the Psychic.
With all of that out of the way, I'll directly address your bullet points:
Can the psychic change the target of his innate telekinesis to the new enemy?
Yes, as long as the psychic passes his Projection roll, he is able to target the new enemy with innate powers.
Can the psychic affect both enemies with his innate telekinesis (provided he can handle enough Kg)?
Yes, Organic Psychokinesis (pg. 200) does not give a limit of how many targets can be selected, and even specifies "material objects" in the description. In english this is technically vague wording (especially since the singular "target" is used later) but could easily be interpreted as allowing multiple targets to be affected at one time. Consult your GM.
If yes to either of those, what kind of action does the psychic need to take for including that enemy: Active or Passive?
According to the innate slot rules, this is a passive action, but requires a Projection role on the part of the psychic.