Installation Error and database installation error

Hi,
I am trying to install Xibo onto a hosting servers.
One of the faults on the first page is :
Allow PHP to open external URLs .
I don’t know how to fix this?

Also on the database installation page when i enter all the details it informs me to enter a password which i have already done but it keeps deleting it- it is the correct one as when i enter a false one it informs me that it is incorrect.
I am completely stumped and would appreciate any help.

Regards,

Dave