Look in your manual:

 Keyboard

For more information about the keyboard, see Using the Keyboard and Touchpad.

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. NOTICE: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal surface (such as a connector on the back of the computer). NOTICE: To help prevent damage to the system board, you must remove the battery from the battery bay before you begin working inside the computer.Removing the Keyboard

1. Follow the procedures in Before You Begin.
   
   
2. Remove the hinge cover (see Hinge Cover).
   
   
3. Remove the two screws at the top of the keyboard.
   
   

NOTICE: The key caps on the keyboard are fragile, easily dislodged, and time-consuming to replace. Be careful when removing and handling the keyboard.

1. Lift the keyboard and hold it up and slightly forward to access to the keyboard connector.
   
   
2. To disconnect the keyboard cable from the keyboard connector on the system board, rotate the keyboard connector latch toward the front of the computer.
   
   
3. Slide the keyboard cable out of the keyboard connector.
   
   

1

screws (2)

2

keyboard

3

keyboard tabs (5)

4

keyboard cable

5

keyboard connector latch

Replacing the Keyboard

1. Slide the keyboard cable into the keyboard connector.
   
   
2. Rotate the keyboard connector latch to secure the cable.
   
   
3. Hook the tabs along the front edge of the keyboard into the palmrest.
   
   
4. Press on the right edge near the top to snap the keyboard into place.
   
   
5. Replace the two screws on the top of the keyboard.
   
   

Hi I need to purchase a replacement keyboard for my Dell Inspiron 1525, where did you get yours?

Welcome to the forums Ray :emotion-21:

The OP might be able to confirm it (although they appear to have forgotten about the thread now?), but I suspect it was probably from either Dell's own 'Parts & Upgrades' or the Parts People (<--- very popular) :emotion-55:

In fact - here you go:  Inspiron 1525 Replacement Keyboard - US$34.95 :emotion-5: