Screen recording

You cannot. Screen recording requires iOS 11 or later, which the iPhone 5c does not support.

https://support.apple.com/en-us/HT207935

Customize your Control Center by adding Screen Recording and follow this guide: https://support.apple.com/en-us/HT207935

Alternatively you can connect your iPhone to a Mac and use QuickTime Player to record the screen.

Thanks, panchososa694, you're right. I didn't take into account that mustapha164 was referring to an iPhone 5c.

Hope the QuickTime alternative is still valid.