How do we solve the issue of access not being able to add or modify records?

To address the issue of not being able to add or modify records in Access, the following steps can be taken:

1. Checklist design: Ensure that the design of the form allows for adding and modifying records. Check the properties of the fields to ensure input and editing are allowed.
2. Relation between tables: Ensure that the relationship between tables is correctly set to avoid any issues with adding or modifying records.
3. Checklist primary key: Ensure that each table has a primary key. The primary key is a field used to uniquely identify records, and without it, there may be issues with adding or modifying records.
4. Check the index of the table: Ensure that the table’s index is set up correctly. Indexes can improve the performance of queries and record modifications. Incorrect index settings may result in the inability to add or modify records.
5. Check the database permissions: Make sure you have sufficient permissions to add and modify records. If you do not have enough permissions, you may need to contact the administrator or the owner of the database to obtain them.

If the above steps do not resolve the issue, it may be necessary to further examine the structure and configuration of the database, or consider reinstalling or upgrading the database.