To edit a Keyword, click on the Keywords tab on the left side navigation bar. Then you will see a list of your Keywords. Click on a Keyword. This will take you to the Keyword view edit page.
Keep in mind that you can only edit the Welcome Message. You can not change your Keyword name, nor can you change the amount of Messages per month associated with your Keyword. Those two items are permanent when you first created your Keyword.
To edit a text message Campaign that is scheduled to go out, simply go to the home screen dashboard of your Textedly account. On the very bottom of the home screen page click on the blue "View all Scheduled Campaigns" button.
You will see all your Campaigns that are scheduled to go out. Click on the Campaign that you want, and then you can edit it or you can delete the Campaign.