How to Chande phone display

@amaanabbasi, Sorry to say iFixit doesn't have a guide for your phone, but I found a YouTube video showing how to replace the screen, assuming we're still talking about the Tecno Spark 6 Air, of course.

Tecno Spark 6Air Display replacement// Tecno Spark 6Air LCD replacement. Tecno spark 6Air teardown. - YouTube

The screen itself is readily available on many sites such as Amazon, eBay or AliExpress among others. Here's just the first one that came up on my cursory search.

Amazon.com: LAILINSHENG TFT LCD Screen for Tecno Spark 6 Air KE6, KE6j with Digitizer Full Assembly : Cell Phones & Accessories

Watch the video to get an idea of what tools would be needed; from my viewing I'd throw out this list.

• Small Phillips screwdriver
• Opening tool
• 90% or higher concentration isopropyl (rubbing) alcohol
• Glue

Hopefully that will tell you all you need to know.