Hello
@wackyblackie is correct in saying that SPF records are the same as TXT records. So any type of TXT record (DKIM, DARMC, SPF) can be pleased in the SPF section.
MX records have their own space.
Unfortunately, DKIM is not supported here because of how checks are made, so you will have to use an external DNS provider like Cloudflare.
And please note that changes to DNS records can take 72 hours to propagate, so that probably explains why you cannot see the MX record from an external service.
Below is a guide to Cloudflare to help you connect: