You just need to open your domain name panel then point the name server to name server that provided by blue host.
Change the name servers in the domain name seller point it to your hosting name servers, then in the cpanel of your hosting server addon domain..
Simple: When you signup you will receive a welcome mail from BS where you can find the Name servers to point your domain name so simply copy them and paste into your domain settings.
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You can just ask your hosting provider to change the nameserver for you. But make sure you provide them the domain control panel
You must change the nameservers on the domain. Blue Host would of emailed your what the nameservers are. Domain propagation can take up to 48 hours too.
I run 3 different hosting plans but I've never had an easier one, than the one I use now. Makes Pl*sk panel look like something out of the dark ages. Really really user friendly.