Guys how can i make pony manes like rainbow dash? using ms paint?

Use a pencil or a paint brush, or use a base

draw a mane or uze baze

1. Copy Paste a base
2. Make the color in your palette something different from the base (for ex. if the base is black and white, make your color red)
3. Use curve tool to trace out the lines in the base
4. Make your initial color white and use "fill" to the base lines to erase them
5. Color the lines you made into whatever color you want and proceed to making your pony.

Other ways...
1. Copy-paste a pic of RD
2. Make your canvas bigger/longer
3. Make your pony while using the photo you Copy-pasted as reference.
4. Profi- jk jk :P