Just follow the instructions
from here and submit it for validation by the Numista team!
Make sure though that the coin/token is not already in the catalogue and that the information you will input to the coin sheet is valid. Another point to have into consideration is the copyright of the pictures you are using, as there are certain websites that have given permission to Numista to use their pictures.
Yours is a token, so it should go to the appropriate section there.
Hope this helps! :)
Stavros