If you have a flat tire, it can be difficult to find the hole.
Put the tire into a bucket of warm water, and inflate it.
Step 1: Locating the Hole
Now you can see where the hole is, and this saves you allot of time and effort.
Step 2: Now to the Repairing
Use some sandpaper something else, to make the rubber a bit rough, so the glue can stick to it.
Step 3: A Bucketload of Glue
Use allot of glue, and stick it together. Now massage out the air bubbles from the middle.
Step 4: Check It and Use It
The orange part should be smooth, or else, you can just use some extra glue.