The site is working fine type in a surname and a list comes up withe names and date of burial.
Click on grave number and all names in the grave come up.
If there are lots of different names it is a public grave and not a family grave.
With this information you can go to Manchester Central Library and find full records on micro film.
The thing that is missing on the grave number is the letter before the grave number and wether it is noncomformist, C of E, RC or Jewish making it difficult to find the actual grave.