How to upload the favicon for my own coin?

It will be great if there is a zero coding method for this. Thank you!

I guess you mean on
If yes, you need to contact Randlabs:
Algorand (ALGO) Blockchain Explorer

See Questions about TestNet and Updating ASA Tokens - #2 by fabrice too

i think you want to upload it here GitHub - tinymanorg/asa-list: Tinyman - Algorand Standard Assets List