Subdomains do not exist by default, you need to initialise its Solana account in order to create it.

Search for your subdomain

Go to and search for your sub-domain. For example, if you own bonfida.sol and want to create help.bonfida.sol, enter help.bonfida in the search bar

After pressing Enter you will see your subdomain even if it has not been registered yet

"No content registered" means that the subdomain does not exist yet

Initialise the subdomain

To initialise your subdomain, click on Edit and enter the data you want to save in the account

Click Edit and approve the transactions. The first transaction will initialise the subdomain, and the others will edit its data with your input.

By default the size of the subdomains is set to 2 kB