Open the DNS card on the Integrations page and click Manually Configure. Besides the A and CNAME records for your website it lists:

• Create a TXT Record for AWS Emails for SPF Records - copy the value v=spf1 include:amazonses.com include:_spf.google.com include:sendgrid.net ~all into a TXT record on your domain. This authorises Amazon (system emails), Google and SendGrid (Sprwt Emails campaigns) to send on your behalf.
• DMARC - TXT Record - host _dmarc.<yourdomain> with value v=DMARC1; p=none;.

Each value has a Copy button, and the card links to instructions for GoDaddy, Wix, SiteGround, Google, Squarespace, HostGator and Bluehost. Add the records at your domain registrar; they are not stored in Sprwt.