How to modify SPF record

Help with Setup/Upgrade
1

MIAB insert default SPF record (v=spf1 mx -all) to DNS, but what to do, when additional rules is needed there?

Multiple SPF records is not allowed, so I can’t add them manually either.

Post must be at least 250 characters
Post must be at least 250 characters
Post must be at least 250 characters

3

Make the adjustment on the Custom DNS page in the admin area.

5

yes, I tested that and as it turned out, MIAB is clever enough to disable default SPF record when custom one is defined. Thanks.