You can't !!
use the cherry scented tampons
Tampons go into the vagina - the opening between your anus and your urethra, where discharge and blood comes from. However if you are unaware of your anatomy it's not a good idea to use tampons, learn more about anatomy and sanitary options first.
You put your finger in her vagina and move it in and out or you could just wiggle it around.
Women can feel tampons, it's just often they feel less obvious than pads and women learn to get used to them - some women cannot use tampons because they feel more obvious to them, also most women who switch from tampons to menstrual cups will tell you that tampons can be felt! Women's vagina's are not that sensitive, especially not further up the vaginal canal, so once in place they are not that noticeable - we don't have much in the way of nerve endings in the vagina.
It's when you finger a virgin vagina or anus.
you take a finger, and stick it in your vagina. Simple.
The easiest way is to thrust a finger in and out of the vagina
Finger Them
The vagina is said to smell slightly like fish, so someone with a "fish finger" would be someone who had stuck that finger into a vagina.
Normally, the fallopian tubes can't be felt. At least through the vagina by "fingering". You can perhaps palpate them through the pelvic wall.
Well you could, but you finger your vagina.
If she is a willing partner, just enter your finger into her vagina.