Februs:
To form the plural imperative in Latin, take the 2nd person plural present form of the verb (eg. amatis, sedetis, regitis, venitis) and replace the is at the end with e. The only exceptions to the rule are velle, malle (imperatives not used) and nolle (nolite). Ferre (ferte) and esse (este) are often considered irregular but applying the rule (fertis -> ferte, estis -> este) correctly forms the imperatives.
.. which is all well and good if I had the faintest idea of what the 2nd person plural present form of the verb 'to read' was....
I believe Latin for the present tense of 'to read' goes: lego, legas, legat, legamus, legatis, legant ... anyway... the 2nd person plural is the 5th one 'legatis' which would make the plural imperative LEGATE. Likewise SCRIBATE ... and COMMENTATE ...
I too got a 4 for O level Latin 40 years ago. I've searched the mostly unhelpful online translation services, and I think Jimisim's MULTUM is the correct adverb form (ie. 'greatly', lots) and either ULTRA or SUPRA can be used I think for MORE.... and we might want to insert a SED (but) before the 'comment' bit so... this gives us (STAY AWAKE AT THE BACK, BLIMP! *throws chalk*) ....
"LEGATE MULTUM, SCRIBATE MULTUM, SED COMMENTATE ULTRA"