Read More button/link is not working

I have to add a read more button while editing the post but it is not working. Also, I try almost every plugin for this but still, it is not working.
Can anyone guild me to solve this problem?

This type of button I want to add to my blog :
https://demo.nomadicguy.com/maicha-blog/

• This topic was modified 3 years, 3 months ago by prashantbhapkar.