I don’t know who the previous owner is of my iPad and it has an activation lock on it

As described, you have seemingly acquired a pre-owned iPad. Unfortunately, it is useless to you.

Here are the Apple support pages that outline the Activation Lock - and the only mechanisms by which it can be turned off:

Activation Lock for iPhone, iPad, and iPod touch - Apple Support

Turn off Activation Lock – Apple Support

As you will discover, unless you are the owner of the AppleID that was last used to activate the device, or unless you can secure the cooperation of the previous owner, you’ll not be able to defeat or bypass the Activation Lock. Without documentary evidence that you are the original owner (such as sales receipt showing the serial number), Apple won’t assist - and nobody here will be able to help you.

https://discussions.apple.com/docs/DOC-250001038

I think you need to take it back to the used store. It is not usable until unlocked...

https://support.apple.com/en-gb/HT201365