How to add accounts to Metamask

Using Browser Extension

1. Click the account selector at the top of your wallet.

2. Click 'Add account or hardware wallet'.

1. Select 'Add a new account' in the subsequent menu.

2. Enter your preferred name and then hit 'Create' to confirm.

As mentioned above, accounts added using this method are permanent and cannot be removed. They are associated with your Secret Recovery Phrase from the point of creation onwards. If you really want to no longer see them in your wallet, you could restore your wallet (do not do this unless you have your Secret Recovery Phrase recorded somewhere, or you will lose access to all of your accounts). Any accounts with a zero ETH balance will not be automatically re-added during this process, meaning you'll no longer see them.

Using Mobile

1. In wallet view, tap the name of the currently selected account.

2. On the account selector menu that appears, tap 'Add account or hardware wallet', then select 'Add new account'.

3. The account will be added when you tap. If you want to change its name later, use the instructions here.

As mentioned above, accounts added using this method are permanent and cannot be removed. They are associated with your Secret Recovery Phrase from the point of creation onwards. If you really want to no longer see them in your wallet, you could restore your wallet (do not do this unless you have your Secret Recovery Phrase recorded somewhere, or you will lose access to all of your accounts). Any accounts with a zero ETH balance will not be automatically re-added during this process, meaning you'll no longer see them.

References

https://support.metamask.io/hc/en-us/articles/360015289452-How-to-add-accounts-in-your-wallet