Select the form you wish to search from the Main Menu

Once the form is open, go to the field in which you would like to perform the search (in this example it will be in Student #)

Click the Find button.

A "Find and Replace" window will pop up, in the Find What field type in what it is you want to find.
Change the Match field from "Whole Field" to "Any Part of Field".

Click "Find Next" until the correct value is found.