To change the nameservers for your domain, you will need to do the following:

STEP 01:  Goto the Domain Registrar (a company from where you purchased your domain name)

STEP 02: Login in to your account

STEP 03: Find or locate your Domain name

STEP 04: Open Domain Settings

STEP 05: Edit/Update/Modify DNS (Nameservers) of domain

STEP 06: Add custom nameservers

• In First Row Add:            ns1.bluehosting.pk
• In Second Row Add:      ns2.bluehosting.pk

STEP 07: Save & conform that Nameservers are Updated

after updating the nameservers, domain propagation or linking may take 10 minutes to 24 hours depending on your registrar company.  That is why show your patience and wait until name servers updated.