Go to www.yoursite.com/wp-admin

So, for example, if your website is www.rbbb.com, you would go to www.rbbb.com/wp-admin

If you have trouble logging in, there’s always a password reset link.

If you’re already logged in, hover over the site name in the upper left-hand corner as follows:

In the upper left-hand corner you’ll see your site name.  Hover over that.

Once you’re logged in, look at the black admin bar at the top of the screen.  You’ll see a link to Edit Page or Edit Post.