Actually, Jim's illustration here
does rather nicely demonstrate pulling the foreskin "to the front". What you do
next is whilst holding the foreskin in that "funnel", to practice getting
one finger - starting with your little finger but then your middle finger -
into that "funnel".
You will want to use a little lubricant to get it to slip in, perhaps a spot of saliva, or if you have it, a "personal" lubricant, or just some vegetable oil - note,
only on the finger that you are slipping in, as if you get it on the fingers that you are using to hold the foreskin open, they will tend to slip off!
You then move on to getting your thumb in, each time getting the finger to go down through the tight part onto the glans - feel around the glans (if you have the finger lubricated, it will not be overly sensitive), and notice particularly where the tight "band" in the foreskin is. Finally, you get two fingers, one from each hand, in and you can then apply them against the tight band to stretch it open - carefully as described in previous threads here.
And of course, you will want to be alternating this "exercise" with the frænulum stretch.