By default, when a new client is entered, their mailing/billing address will also be their default site address. A client can only have one mailing/billing address, but can have multiple site addresses.
To enter a different site address on an order, from the order form screen, click under the Job Site section of the order form where it shows the address, and the Site List screen will appear. Here you can look through the sites you may have previously entered for this client and see if there is a match. If not, just click the New Site button at the bottom to enter a new site address to be used for this order.
When entering a new site, it will at first copy the information from the mailing/billing address just to potentially save you some typing, but whatever needs to be changed, just type it in over what is already there. When you click OK, the site address on the order will be set to this new site, and that site will be added to the list of sites for them client.
To make changes to site address information (edit the site), right-click on the order form, and choose Site > Edit Site. Keep in mind that when you make changes to a site like this, if there are other orders that have been entered for that site, the address on those will also appear with the changes you make. If you are making a correction, this is the behavior you want, but if you really need to enter a different site address without changing the other one, be sure to do that.
WARNING! Be aware that when you click on the site address on the order form, the site list screen will appear for you to search and choose a different site, as previously mentioned. Notice that the first site in the list will be selected, so if you just click OK, you will be changing the site address on the order to be that site, which may not be what you meant to do. On any screen in the program, if you aren't meaning to change something, be sure to hit Cancel and not OK.
