how do you conduct a chior?

You need to learn to be able to follow several singers at once

I thought the conductor was meant to lead, not follow.
This is not one of my skills but I think that, as with any conducting, knowing the score well is a good starting place.
And knowing what each voice should be doing.

Conducting choirs depends on the sort of choir that you have in front of you! They need to see you clearly and to understand just what you are telling them to do. Make sure that you are wearing a colour that will not disguise your baton or your hands. A white baton against a white shirt will not show well from a distance. If the choir members are used to following a conductor then you would direct them in the same way as an orchestra but if not then you will need to use movements that they will understand easily. Point clearly to bring in different voices and give them some warning by looking at them just before. Use smaller movements for a small sound and more flamboyant ones for more sound. Make the endings very clear too and try not to mouth the words throughout or they will follow your mouth and not your baton or hands. I hope that this post makes some sense; I have just consumed two glasses of wine.

And make sure you are only moving your hands/arms - there's nothing worse than watching a conductor who is also tapping their foot, giving conflicting beats.

The conductor's role also include making artistic/interpretive decisions about phrasing, tone, etc. Make sure you have a clear idea of what you want for the piece before you go to rehearsal.

Do you know the basics conducting patterns?

Thanks all
yes i think i know the basics conducting patterns its my left hand that has nothing to do

Your left hand can do all of the bringing in of parts and make movements to show dynamics. If any one goes wrong it can make rude signs too.

I use my left hand for queing and dynamics and my right hand for the beat. Basically I apply the same skills as if I were conducting an orchestra but tend to use my hands rather than a baton. I'm also very careful about size and position of Gestures. Both Mike Brewer and Colin Durrant have written excellent books on Choral Conducting and reading them has helped me tremendously.

I also make sure that rehearsals start with choral warm ups, a combination of vocal exercises designed to warm up the voice and listening exercises designed to get all members of the choir to work as a unit.

If I direct a choir from the keyboard I tend to deal with entries and exits using my eyes and my head.

Training choir membes to sing with their ears though is the most important thing, that frees up a choral director a lot.

Most difficult thing about conductiong anyone is that the sound always comes after the gesture - it's so easy to start responding to what you hear rather than keeping the pulse going. If you follow then the piece just slows down. My biggest problem is facial expressions - someone described it as "Why do you look like you're going to Party of the Year? It's in B minor!" The more you think about it the worse it becomes.....

Trouble is when you want your choir to do something dramatic and you look as if you're about commit mass murder!