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Procedure:

Step 01: Go to cloudflare.com, enter the login credentials username and password and login to dashboard. Step 02: In Cloudflare’s dashboard, Search the domain in which you want to add the SPF record, then Click the DNS button : Step 03: On the DNS Management page, go to the Records section and Click the Add button. You will then see a form that will allow you to set the settings for your SPF record, As shown :
Make sure that the record type is TXT, the name is set to @, and the value is set to the SPF record. Right-click the Save button and add the record to your list.
Step 04: Our free SPF record checker can help you check the published record. It will take some time for the change to propagate in the DNS, so if you can’t find it, give it a try again within one hour.