You will see a table that has things like A, CNAME, MX with an IP address and also some may have @
On this screen you will want to select Add - you will get a pop-up you should select TXT, host is @ and value is the string you have from google verification
For the TTL (TTL = Time To Live which is telling the internet how often to check for an update) I set this to custom 600 which is 10 minutes
Then you click the save/add button and you should be good to go once you go back to google and say verify.
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