I have purchased one domain from Qualispace.com and I have hosting for my domain from another site. so what is the process for hosting please help me.
Firstly you have to add your domain name in your hosting account, then you have to point the domain to the hosting server by nameserver or A DNS record.
You will need to contact the domain registrar (in your case Qualispace), ask them to update the Name servers that your hosting provider have provided. Doing this domain will resolve from the hosting server. You can then upload the website contents and view it.
Do you have hosting account created for that domain name? If yes, just go to the domain control panel and add nameservers provided by your hosting company, should look something like ns1.hostingprovider.com and ns2.hostingprovider.com