Here are the steps to put up a backsplash:

1. Measure your wall to determine its square footage.
2. Remove all appliances and cookware from your countertop before you start to tile a backsplash.
3. Getting the wall ready properly is essential to having a successful tiling project. Clean the wall thoroughly to remove any dirt, grease, or debris. You may also need to sand down any rough spots or bumps on the wall to ensure a smooth surface for the tiles to adhere to.
4. Install Backer Board (Optional)
5. Pre-Lay Tile
6. Cut Tiles
7. Prepare Mortar
8. Apply Mortar

For more detailed instructions, you can check out this [step-by-step guide from Home Depot](https://www.homedepot.com/c/ah/how-to-install-a-tile-backsplash/9ba683603be9fa5395fab9046ad9c25) or this [step-by-step guide from Beyond Bending](https://www.beyondbending.com/putting-up-backsplash-a-step-by-step-guide.html).

I hope that helps! Let me know if you have any other questions.