I need a developer to help with facebook shopping and pixel

Hi, I need some help with my website, connecting the store to facebook/instagram shopping and making sure the pixel is set up right with relevant metatags. I have been having alot of issues with facebook not allowing my store to connect as I am getting this issue - The following required properties are missing: fb:app_id

If someone could please help, i have tried to do it myself however I am not a developer and i am stressing myself out. All I need if for someone who knows how to connect pixel and facebook shopping to my site.

look forward to hearing from you,
Rachel