Yes of Curse you can change or update your nameserver of your registered Domain From MeroHosting.
Step 1: Login your from Merohosting.com
Step 2: Click on Domain >> my domains >>> choose your registered domain name and click on Setting Icon
Step 4: Go to manage nameserver
Step 4: choose custom nameserver:
Step 5: Paste your nameserver and click on (Change Nameservers)
If you need More Help
Open a Support ticket or join live chat
Team will help you accordingly.