Help me understand my old PumaPay account and Ethereum

I thought I was being paid in Bitcoin several years ago via a PumaPay account. Well, I finally found my seed phrase and logged in. The $ in the account is just in USD so I am guessing I was just having money deposited into an eWallet. Well, I want my couple hundred bucks. However, the PumaPay app says I have to buy ETHEREUM to be able to transfer funds. I don't know what any of this means. Please help!