How to create a TXT record
Step 1
Logged into your cPanel in the "DOMAINS" tab, locate the "Zone Editor" item.
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Step 2
On this screen you select the domain you want to edit and click Manage.
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Step 3
Now click on "Add record" enter the name and in the TYPE tab select "TXT", in the TLL option you can leave the default values, in "Registration" enter your TXT key.
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And finally just click "Save record".