Press the 'Send Phone Data' on the toolbar.
You will then get a choice of what to send to the phone.
In the left column you can choose what to send. You will generally only want to send what you have changed. For example, you would only want to send phonebook if you have made changes to the phonebook within BitPim.
In the right hand columns, you have a choice of adding or replacing (both choices aren't available on all data types)
Add
The items you have in BitPim will be added to those already on the phone. For example, if you only have mycat.bmp in the wallpaper folder, then that will be added to the existing wallpapers on the phone. Note that if there is already an item with the same name, then it will be overwritten with the new item of the same name.
Replace
All items in BitPim will replace those in the same category on the phone. For example, if you have 3 wallpaper items in BitPim, you will end up with only the same 3 items on the phone. All others will be removed.
Operations talking to your phone are done in the background. The status bar will show that BitPim is busy. You can still navigate around, but you should not make any changes until BitPim is no longer busy. BitPim will reload data after talking to the phone anyway. This is because it may have to have changed some of the data as it wrote to the phone. (For example index numbers are assigned to wallpaper and ringtones and phone numbers have all punctuation removed).
BitPim Online Help built 17 January 2010