Check your php error_logs; this looks like a 500 error that should be logged there.
"The storage engine for the table doesn't support check" is not, by itself, indicative of an error.
Ok, now search in that page for DOCUMENT_ROOT (usually Ctrl+F will let you search in a page)
After you obtain the document root, you can proceed to follow Brogan's instructions.
This site is
https://xenforo.com/community
therefore, you would do this
https://xenforo.com/community/admin.php?tools/phpinfo
if you needed to see the phpinfo for this site.
So you'd take your forums URL and paste /admin.php?tools/phpinfo into the end of it.
Do you not see an entry right below that? Mine is:
-0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid
This negative score will become positive if the signature is validated. See immediately below.
0.1 DKIM_VALID Message has at least one valid DKIM or DK signature
Great...
Don't want to put words in their mouth, but they may have meant a VPS-1 with cPanel wouldn't run xenForo well. Our VPSes come with CentOS 7 / 64bit now and the 1G of RAM with the VPS would not run well.
https://documentation.cpanel.net/display/ALD/Installation+Guide+-+System+Requirements
Note...