This tab is in the Debug tab.
The Change ID tab allows you to change the ID of a record in a table, along with changing all references to that ID.
To change an ID, fill in the fields that specify what row to change:
Table: the name of the database table containing the primary data.
Old ID: the ID value identifying the row to be changed.
New ID: the new ID value to set into that row.
After filling in the above fields, press the Change ID button. The total number of rows changed will be shown in the status line.