How to knit intarsia in the round

When you try to find information about knitting intarsia in the round on the internet, most of the time you’ll be told that it’s not possible. The big problem when you try to do it: your yarn ends up at the end of your row, while you need it to be at the beginning.
If you don’t like bending the knitting rules, you’ll have to learn how to live with it: knitting intarsia in the round cannot be done. If, on the other hand, you don’t mind a little experimenting, there are actually two methods to solve this problem:

• the yarn over method
• the ‘stranded intarsia’ method

Both methods are explained below.

Yarn over method

1. Knit in the round until you’ve done the last row before the intarsia starts.
2. Use your main and contrast colours as you would when knitting intarsia flat, until you get to the end of the row.
3. Turn your work, so the wrong side is facing you.
4. At the beginning of the row, do a yarn over.
5. Since you’re working on the wrong side of your work, purl the rest of the row as you would when knitting flat, but do not work the last stitch of the row yet.
6. Purl the last stitch of the row together with the yarn over you made in the beginning of the row, seaming both sides together while doing so. Pull tight enough.
7. Turn your work, so the right side is facing you again.
8. At the beginning of the work, do a yarn over.
9. Since you’re working on the right side of your work again, knit the rest of the row as you would when knitting intarsia flat, but do not work the last stitch of the row yet.
10. Knit the last stitch of the row together with the yarn over you made in the beginning of the row, by knitting through the back loop of these two stitches.
11. Repeat steps 3 to 10 until the whole intarsia part is done.
12. Continue knitting in the round as you would normally do.

Source-- http://abfabulies.com/2011/07/how-to-knit-intarsia-in-round.html?lang=en