First you need to login to your administration panel using your username and password.
Now you click on Content >>> Article Manager.
choose that particular word you want to change to a link.
You will be give a text editor press all you need to do is to implement the link.
You will be given a new window or box just insert your details and then click insert button below and that's all you need.
I hope this tutorial will serve you better don't forget to drop your comment below thanks.