Whenever i activate a quest, it never pops up on my HUD, like no arrow, so i have to keep going into my pip-boy, please help

It depends on the quest give the name, and then I'll give an exact answer.

Yeah it could be like a star bottlecap quest where they don't exactly tell you where there at. Prob a quest like that

Cheers

Some quests are unmarked, and they only appear in the notes, and your head.