How do I properly set up a DKIM entry?

Question

Domain Name System

Greetings! I'm trying to figure out how to insert a logo into a mailbox. Created BIMI, DKIM, SPF, DMARK records.

Here with record DKIM I will not understand. Generated an account on the site, get an entry and two keys - public and private:
default._domainkey.example.net the IN TXT "v = DKIM1; the k = rsa; p = fr45DFfMA0GD3GSIb3DQEADFAQUAA4GNADCBiFDFQCg45H2kHgYiB8RWmrUpMgEKdfD
OJyd4RtR899KdBLFNWpFZUXo3dEZu7 + EDSRR0 3u1UCzv7J + / + 1tF19j ylZuKNgD1hzmm
pepBhEfpfj + H2 / rJdfgtLiBa4z +fpmFzy8bO2WvfiMrwiLpo8SCBGm7FPvgZ
lCQhWqtIHN7qHdeRtoywIDAQAB"
hosting nic.ru Naturally,
the check on the site https://mxtoolbox.com/SuperTool.aspx does not pass.
Where should I insert/write the private key?

Answer 1

The private key is specified in the settings of your DKIM server, which signs emails.

Answer 2

DKIM is specified in the DKIM server settings, the public key is published in DNS.
I remember setting up with an assistant like this https://www.dmarcanalyzer.com/spf/checker/