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Steps:
1. Click picture above.
2. Open Your NotePad
3. Type code in the picture.
4. Replace your_ym_id (without yahoo.com/yahoo.com.my)
5. If you use t=2 ( you will get YM appearance like mine at right side)
6. Copy edited code from your NotePad.
7. Click edit layout of your blog, at page element section, click add element.
8. Add html element and paste code copied from your NotePad into html element.
9. Save and view your blog.
P/S : you also can try t=3
t=4 or what ever number you want and you will get different ym
appearance.