quest cap?

I tried asking this ingame, but no one really answered.

 

anyway iv probably accepted like 6 or so quests, the only problem is there are only 4 slots on the right side, so i cant complete the quest for the ones that arent showing up. there is also a new quest on the right with an exclamation mark for me to accept, however it says that my mission log is full. if i knew there was a quest limit cap, then i would have ignored some of the stupid quests, but the blinking exclamation was extremely annoying.

 

is there a way to view the mission log, so i can remove quests or something? or am i just missing something?

Just complete the quests you’ve already accepted. The “training missions” don’t have a timer or anything, they’ll stay there until you accept and complete them after which they’ll disappear.