Hi,

The Table which you have created and added it as a Related List on your form won't be accessible to ITIL Users by default.Once the Many to Many Relationship Table has been created, you need to configure a Create, Read & Write Operation ACL on your M2M Table both on Table and Field Level to have the New & Edit button displayed on your Related List.

While configuring the ACL, Mention the "itil" Role in your ACL.

For example, below is the screen shots of an Create Operation ACL on Table and Field Level. Similarly you can create for the Operations mentioned above:

In the above screen shots Replace your Table Name just and similarly Configure the same for other Operations Like Read & Write.

Hope this helps.Mark the answer as correct/helpful based on impact.

Regards,

Shloke