I'm confused about who can use scrolls in 5e. In the DMG, p139 under MAGIC ITEM CATEGORIES: SCROLLS it states "any creature that can understand a written language can read the arcane script on a scroll and attempt to activate it". This implies that ANYONE can try to cast a spell using a scroll. However, on p.200 in the "Spell Scroll" entry it states that "if the spell is on your cast list you can use an action to read it...otherwise the scroll is illegible". Then there is the bit about a DC 10+scroll spell level arcana roll if the spell is higher than a spell slot than you can cast.
So, which is it? Can anyone who can read a language use a scroll (like a fighter) if they make an arcana check, or JUST a PC with that specific spell in their spell list (only spell casters)?