How can I change a tourist visa 60 days in non-immigrant for voluntary work.

and can you extend the visa.

As far as I know immigration do not do a change of visa status for those that can qualify for an extension of stay based upon working as a volunteer.

You will have to go to a nearby embassy or nearby consulate to get a non immigrant O visa. You will need documents from the organization you are working with to apply.

In order to get an extension of stay (visas are not extended) you will first need a work permit.

I know of a case in Chiang Mai where the person was send to Bangkok for the conversation based on volunteering, but that is a couple of years ago.

I would contact BKK-immigration to see if they are willing to do it. But you will of course need all the paperwork, including work permit application. and I would get a supporting letter from the local provincial governor.

In all, might be best to apply for a non-O abroad if far from Bangkok.