This guide will assist you with changing the name servers (DNS Servers) associated with your domain name, follow the below steps:
Log in to the Absolute Hosting Client Service Area using your email address and password.
One logged in, click on the Domains icon 
On the My Domains Page, locate domain name using the search function, and then click the drop down and click Manage Nameservers
On the Manage Nameservers page, change the name servers and click Save Changes
After changing the nameservers for your domain name, please be patient whilst DNS propagation completes, this usually takes between 4 and 24 hours.
You can get a list of DNS Servers that Absolute Hosting offers by browsing the What Name Servers Do I use when Registering or Transferring a Domain knowledge base
