Description tag is not visible

I have also found that desc tag is not visible in header.php file
Do we have to add desc tag here?

[excessive code removed]

Please use the forum for that plugin here:

https://www.ads-software.com/support/plugin/all-in-one-seo-pack#postform

And see this before posting code – use a pastebin for large files:
https://codex.www.ads-software.com/Forum_Welcome#Posting_Code