How to check quantity of my atom token

I participate fundraise to use BTC
but I can’t check my atom token
If i enter my deposit address 126B9sG2Rt~~~
Homepage said address is too short
Plz I need your help

You need to enter your Cosmos address, not the BTC address you sent to.

The Cosmos address is included in the OP_RETURN of the transaction sent from the Bitcoin address.

You can also recover it using your seed phrase that you wrote down - but please be careful when typing that phrase into a computer and preferably only use an offline machine that is never connected to the internet.