Hi,

My apologies. This is my fault.

You cannot hook to the wallets_multiadapter_coins filter from a theme because it runs before any themes are loaded.

You have two options:

1. Enter your data into assets/coins.csv. This is not ideal because if there is an update to the multiadapter your csv file will be overwritten. But this can be a way to quickly move forward for now.
2. The best course of action would be to take the code you have and wrap it into a plugin. This is very simple:
   1. Create a new PHP file
   2. Add some headers as shown here
   3. Paste your code beneath the headers
   4. Copy the PHP file into your wp-content/plugins directory
   5. Go to Plugins and activate your plugin.

Thank you for reporting this problem. I will update the online instructions today.

kind regards

Alex