Add a MTA_STS text record to the DNS on 1&1 IONOS

[Willzip]

I'm unable to add the MTA_STS text record to the DNS on my 1&1 IONOS account as per below instructions from Shopify Help Centre as  I am unable to find the Value field as per step 6 . Any suggestions please?

1. Log in to your 1&1 IONOS account.
2. In the Your domain section, click Manage Domain.
3. Click DNS.
4. Click TXT.
5. In the Host Name field, enter @.
6. In the Value field, enter the TXT value that you copied from the Shopify admin.
7. Click Save.