Hi,
Change Log Entries is based on "AllObjWithCaption" table which is a Virtual Table. The virtual table is a lookup table of functions used to resolve function calls in a dynamic/late binding manner.
This is a read only table and so you can not enter record into this table.
All the basic default tables should already be present in this table and so you should be able to turn it on. just make sure there are no filters on the page.
Please refer to the screenshot below:
Departments/Administration/IT Administration/General/Change Log Setup
