Thread your cotton through your needle
Go through the top of the extensions (where the cotton is). Where u want your clip to start
Put the needle through the first hole in the clip like this
Keep repeating threading until it looks like this going in the hole and back around. This will secure the clip firmly
You want the thread to be neat flat and tight.
Here's a picture of one strip that has clips on
Keep repeating this method until the extension weft is evenly spaced with clips. Now your ready to put them in!