To edit an entry, simply click on the current value. A box will open, make the changes and then press enter. You must press enter to make the value change. In some cases you may get a OK or Cancel, you must click on one or the other to lock-in the change.
There are some exceptions: you can't change the Camp Registration Number or the Grid Square, they are both calculated values, and will be adjusted automatically if needed.
To delete a record, put the edit code in the delete box and press Submit. A confirmation box will open, select OK to delete, or cancel to automatically go to the editor.