Menstrual Cup advice

I recently got the Lena cup finally came in the mail today.

I put it in put didn't realize how sore I am it's hard to have cup thumb and index all up there to place the cup

I like it just now my body sore and I think it's a light day for me anyways so it's nice to trial it

I'm having difficulty debating where the stem is ugh

any help.or advice would be appreciated