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The following are the steps to install the Tweetily plugin:

1. In your WordPress dashboard, under the option "plugins", click on "Add New".
2. Click on upload at the top.
3. Browse the location and select the Tweetily plugin and click "Install Now".
4. To turn the Tweetily plugin on, click Activate.
5. Your WordPress dashboard should now have the option "Tweetily" if the plugin is active.
6. You can change the plugin options from Tweet Old Posts under settings menu.

Alternatively you can also follow the these steps to manually install the Tweetily WordPress plugin:

1. Download the latest version of the Tweetily plugin to your computer.
2. With an FTP program, access your site's server.
3. Upload the "Tweetily" folder to the /wp-content/plugins folder.
4. In your WordPress administration dashboard, click on "plugins" from the menu.
5. You should see "Tweetily" plugin listed.
6. Click "Activate" under the Tweetily plugin listed.
7. Your WordPress menu should now show a "Tweetily" option item.
8. Update the Tweetily plugin settings and save to start tweetily.