How would you use this?

MizYummii,

When you are curious about a product, I highly recommend checking out the reviews to see if they answer your question first. On this specific product, there are 8 reviews. You can find them here: link

I clicked on a random review to see if it had the answer you were looking for. The very first review that I had clicked was this one: link

Silverdrop did an EXCELLENT job on this review and in the very beginning of her review, she states how this specific toy is used. In her review, she also has photos of the toy, and the toy being worn!

Here is the information taken from SilverDrop's review that will answer your questions (I've copied and pasted):

Mr Right is a limp packing cock, designed for FTM trans men, or for girls who want to experiment with gender play and cross dressing. You can wear it under your clothing to present a somewhat sizeable bulge, or display it in the bedroom with just the packing strap to give the illusion that it is your own cock. It can be sucked on and can probably be inserted vaginally with some effort, but it is too soft to be an effective insertable toy.

Probably not. It's far too squishy and has too much give. Wouldn't have enough resistance.