The UI application represents on https://alcor.exchange (Alcor-ui) and uses https://github.com/eoscafe/eos-airdrops repository as the default token information provider. You can add token of your project to eos-airdrops repository to be able see it on Alcor. It might take some time for PR approval.
Also, you can do direct pull request in alcor-ui repo: https://github.com/avral/alcor-ui go to: assets/tokens/<:chain>/ folder and add token with name following structure: "<:symbol>_<:contract>.png" (both names should be lower case). Token image should be 64x64 sized and .png format.