I have a domain that i need to change it to another one. How can i do this?

i have account and contact tabs are there in community.
I have added one vf page under account detail page in account. same at contact also i have added one vf page in contact detail page.
so, the problem is here.. i am getting contact vf page in account detail page as error page.
My requirement is i dont want to see that contact vf page is not visible in account detail page.
It should be like that account vf page is account and contact vf page is visible for contact....

Please give me answers as soon as possible....!!

Thanks advance...

Hi All,
Just wanted to check, all the possible ways where different user's from same profile can access different objects wihtout uisng permission sets.

Thanks.

issue:
While creating a New Opportunity, if user is pressing the “Enter” key, then the record is not getting save. Afer clicked on ENTER its redirecting to the opportunity list view page.
My expectation:
After all data entry in the new opportunity VF page if user click on ENTER button then the data should save and details page should open.
What is the issue on the VF page? Why ENTER button not working?

 

I have a domain that i need to change it to another one. How can i do this?