Knit the first stitch with the new color.
Changing yarn color knitting. When changing yarn colors on straight knitting needles for a flat knitted piece, you will always have a distinct right and wrong side of your work. Pick up the tail end of the new color in your right hand and lay the yarn between the needle tips. Remember not pull it, so.
Remove your thumb and tighten it up. Adding stripes to a knitting pattern is not that difficult, just remember to change colors at the end of a row or round. Hold the working end of the yarn in your usual way.
Even with a pattern like the garter. Basically you want to hold your new contrasting color (cc) of yarn the same way you would your main color (mc) of working yarn and work. Drop the first color and start the second simply taking that new yarn, and making a loop.
Once the yellow is pulled to the side take the white yarn and twist it over top the yellow and knit as you normally would. Keeping the tail of the new color in place. Unravel back a few stitches, then take your new colour yarn and prepare your magic knot.
If you're knitting in stockinette stitch. Instructions drop the first color and start the second. Learn how to change colours in knitting and you’ll open up a whole new realm of possibilities.
The important thing to remember when tightening your knot is not to leave too. The only thing you have to do is pass the strand you’re not knitting above the one you are going to use to work the row. Make a loop on your thumb.