server error

Use FTP to replace whichever file you edited with a fresh, unedited copy. See Filezilla and FTP Clients ? WordPress Codex.

I believe I inserted a piece of code in a place it did not belong

And where was that?

in the sidebar.php, i think.

As songdogtech said, try replacing that file with a fresh copy from the theme.

okay so i downloaded the filezilla file client, and i connected to the server (or so i thought). i uploaded all of the files.. but now i don’t know what to do! helP!

What files did you upload and where did you upload them to?

i uploaded all of the files for the theme i downloaded from themeforest to my “remote site.” i wasn’t sure whether to do https://ftp.mydomain.com or just mydomain.com, so i did both. but my website still won’t load.

OMG I FINALLY FIXED IT!!! THANK THE LORD IN THE HEAVENS ABOVE! And of course, many thanks to you esmi!! thank you so much for all of your help!