How do you self pleasure on your period also what is finger popping?

Answer 1

Self pleasuring on your period is a matter of how dirty you're willing to get.

If your only need clitoral stimulation, then a finger on the clit with some spit of lube should be easy to get away with without much of a mess.

If you need vaginal stimulation then I can recommend you use a genital soap to wash out your vagina first and then use either your hands or a dildo. Or you could do it in the shower where bleeding isn't a problem.

Only wash out blood from your vagina with genital soap and water if you're really terrified of blood since the vagina generally shouldn't be rinsed. It's self cleaning.