Connecting square space website with domain

I have created a website through square space, but have not been able to transfer that information to my domain that I just created. How do I go about transferring the existing information from my trial website to my new domain?

I take it you did not create the domain thru your squarespace site? If not then you use the config/ settings domain option "use a domain that I own" and follow the directions. This may mean making cname and other record changes on the site that hosts your domain. 

I did use the instructions, but only the CName resolved.  The other two are not.  Is this common?  My domain was purchased through siteground.

These are the directions, Squarespace does not auto log on to Siteground so you will need to do that yourself and make sure all the following records  in this step by step guide match:

https://support.squarespace.com/hc/en-us/articles/205812378-Connecting-a-domain-to-your-Squarespace-site