You’ll need to temporarily switch to another theme (like Twenty Fifteen) until you get it sorted.
If you can’t access your admin pages, you’ll need to use an FTP client (like FileZilla), or your host’s cpanel (or File Manager) and navigate to the files on the server.
In your WP installation there, find wp-content/themes and rename the active theme’s folder to something like mytheme-hold, or delete it altogether. That will disable the theme and hopefully allow you to get back into WP admin. WP will use a default WP theme in its place (probably Twentyfifteen).
I’m able to login to the Admin Dashboard – and I have access to my hosts (Yahoo) File Manager. The ‘<?php’ updates that I made to the code do not show up when I have reopened the files through Editor. But the errors to not show up in the theme check anymore ? Website still not working.
Attempted to download another Theme (widget compatible) and got the following error > Downloading install package from https://downloads.wordpress.org/theme/customizr.3.3.20.zip…
Download failed. error:0D0890A1:asn1 encoding routines:ASN1_verify:unknown message digest algorithm