Remember: You can click the images for a bigger version if you can't see it very well.
Step 1. Your current bookmarks probably look something like this - Island Paradise isn't on there.
Step 2. Click on the "Account" button on the blue Facebook toolbar. Then click "Application Settings". You should reach a page similar to this one. Find Island Paradise on the list and click "Edit Settings".
Step 3. A popup should appear. Click on the middle tab, which reads "Bookmarks". Check the little box which reads "Bookmark Island Paradise". Click "Okay".
Step 4. You can choose to stop here. If you do, you will always have to click the "More" button on the left in order to see Island Paradise.
Step 5. Go back to the Applications Settings page. You will notice a small drop down menu. Click on that and choose "Bookmarked".
Step 6. Island Paradise will appear at the bottom of the list. Click and drag it to the top of the list and release it.
Step 7. Island Paradise should now appear at the top of the list, like this.
Step 8. Now Island Paradise should appear on the left side of your feed, so any time you want to access the game, just click Island Paradise from you feed!