To select which conversations to synchronize:
1.Press 
> 
> Gmail.
2.Press 
> More > Settings > Labels.
The Synchronization settings screen opens, displaying a list of your Gmail labels. Below each label is its current synchronization setting: Sync all, Sync 4 days, or with no label. (Conversations with no label are not synchronized.)
3.Tap a conversation label whose synchronization settings you want to change. Choose from the following options:
Sync none: Don't download any conversations that only have this label.
Sync 4 days: Download the previous 4 days (or number of days you set) of conversations.
Sync all: Download all conversations with this label.
To set how many days of conversations to synchronize:
1.Press 
> 
> Gmail.
2.Press 
> More > Settings > Labels.
3.Tap Number of days to sync.
4.Enter the number of days, then tap the OK button.
Appending a Signature to Your Messages
You can add a signature to every email you send, such as your name, contact information, or any personal message.
1.Press 
> 
> Gmail.
2.Press 
> More > Settings > Signature.
3.Enter a signature or other information.
4.Tap OK.
Changing Gmail Settings
You can change a number of settings for Gmail. Each Google account has its own settings, so your changes affect only the current account. (See “To switch accounts:” on page 147.)
Notification volumes and some synchronization settings can also be changed in the Settings application. (See “2C. Settings” on page 51.)
1.Press 
> 
> Gmail.
2.Press 
> More > Settings.
