first open your ring base, this costs me 1€ so very cheap yay!

now roll the wire around the pliers two or three times, as close to the end as possible so that you en up with a small circle
depending on the holes size you may have to create a small loop (next pic) to avoid the wire from getting through those holes...

starting from the center of the ring base, insert the wire from the inside out

keep adding the beads repeating steps 2 and 3
then create a loop with the wire on top of the bead to lock it

it should look like this..
when you end adding all the beads, put the two parts of the ring base together and adjust to your finger size.