Open the edit form of the page you want to work in.
Click anywhere on the link that you want to edit and click the Link icon. This opens "Insert/edit link" popup.
Click "Choose File, Page, or Link" option to navigate to the appropriate asset. Once you have located the asset to which you wish to link, click Ok button to update the link. If it's an external link, simply paste the new URL in the Link field.
Next, click Save and Preview and Publish like you normally do to publish to the live site.
Remove a Link
Open the edit form of the page you want to work in.
To remove a link, place the cursor somewhere on the link.
Click the Unlink icon. This removes the link from the text.
Next, click Save and Preview and Publish to publish to the live site.