How do I adjust the alerts on my Droid Mini?

You can put the handset in vibrate mode by holding down the volume button on the right side of the handset until the handset vibrates

Here are other methods.

Silence Notifications and Ringtones:

Press and hold the power button until you feel a vibration. This box will show up in the center of the screen with ringer options:

Touch Silent mode to silence all sounds (including call and notification ringtones) except media and alarm (you must silence media and alarms in their own applications).

NOTE:  You may press and hold the side volume key to toggle this on/off . This setting this will override any individual notification alerts you have set

To adjust Ringtone volume  

Touch Apps  > Settings > Sound >Volumes.  This opens a dialog where you can drag a slider to set the volume of ringtones that sound when you receive a phone call.

To adjust Specific Notifications (Phone ringtone, Email, Calendar, Messaging) use the following:  

Phone

          1. Touch Apps        

          2. Touch Settings

          3. Touch Sound

          Note: If you do not want the phone to vibrate make sure the Vibrate when ringing box is not checked.
   
          4. Touch Phone ringtone, and make desired selection

Mail

1. Touch Apps 

2. Touch Email (touch Gmail for Gmail accounts) 

3. Touch Menu

4. Touch Settings

5. Touch the account you wish to modify.
 
6. Touch Inbox sound & vibrate

Note: If you do not want the phone to vibrate make sure the Vibrate box is not checked.

7. Touch Sound, and make desired selection
 

Text Messaging

1. Touch Apps

2. Touch Messaging

2. Touch Menu   

3. Touch Settings

Note: If you do not want the phone to vibrate make sure the Vibrate box is not checked

4.  Touch Sound, and make desired selection

Calendar

1. Touch Apps

2. Touch Calendar
 
3. Touch Menu 
 
4. Touch Settings

5. Touch General settings

6. Scroll down to and touch Choose ringtone

Note: If you do not want the phone to vibrate make sure Vibrate is set to Never