How do I setup use my VOIP phone?

1 Handset
2 Speaker
3 Message Waiting Indicator
4 IP phone screen
5 Line keys
6 Softkey buttons（Add、、BXfer、Confrn、Connect、··········、Exit）
7 Navigation button
8 Center Select button
9 Messages button
10 Hold button
11 Setup button
12 Mute button
13 Volume button
14 Speaker button
15 Headset button
16 Keypad