When entering a url into the link section of a Menu tab, add a query string parameter called "focuson" with a value of the name of a field in your table to make the cursor appear in that field when the page loads.

Example

Your users would like to have the mouse cursor in the Name field when they load a Contacts form, so you add &focuson=name to the end of the query string on the menu that takes them there (see Menus).