Okay, so I've successfully navigated to the "Custom DNS" part of my blog's dashboard.
Now, I'm not the most code-savvy person in the world. I've pulled some information from my forum provider on how to do this:
I have already a homepage, can I link a subdomain with my forumotion board?
Yes, of course - it's almost the same procedure as above. Just assign the CNAME to your subdomain instead:
When you choose the sub-domain which you wish to use on your forum (forum.my_domain, for example, is a sub-domain of my_domain), you have to create the corresponding CNAME entry in the DNS administration of your domain: a CNAME entry allows to point an url towards the other one in a transparent way. That way, you can link forum.my_domain with forumotion board YourForum.forumotion.com.
Any recorder of domains names possesses different interfaces, and thus different methods to create such CNAME. However, in a general way, the process takes place as described below:
Connect to your user account on the site of your domain name provider, and go to the DNS management.
Check that the chosen sub-domain is not already used.
In the generally entitled field "source", "origin", or "alias" enter the prefix of sub-domain (i.e. "Forum" if you want to use the sub-domain forum.my_domain).
In the generally entitled field "destination" or " target host ", enter the original url of your forum, address.my_forum.
You will maybe have to inform the TTL (Time To Live): define the maximal possible value here.
The link to my forum is http://tubbycraft.forumotion.ca/. I want to make it so that (like I said above) I can put that on my blog, and when it is clicked, it directs the user to my forum and the url of the forum at the top of the screen is http://forum.tubbycraft.com/