Weaving in Ends

From BluWiki

To do this you need to grab yourself a yarn needle, also called a darning needle. It's a little more secure to weave the lower strand upwards and the higher strand downwards. Trim your ends to about six inches/15 centimeters. Thread the tail onto the needle.

Now pull the needle through the fabric, in and out, following the path of the yarn in the garment.

When it's secure, bunch up the fabric, just a bit and snip the tail.

Now smooth the fabric. If a tiny bit of tail pops out, snip it.

The video showing how to do this is here.