Read the document to make sure it meets your needs. Make sure that you have selected or created the right notice regarding the works you intend to do. There are three types of notices:
Party structure notice
Line of junction notice
Notice of excavation
Remember that if you have any questions you can easily Ask a lawyer.
For more information read Party wall matters.
Note that all joint owners should sign unless one is authorised to sign for all joint owners and this document should not be signed online.