1. Dial Access Number. You can view the current list of countries with access numbers at "call rates" page.
2. Enter your PIN number if required. If you make calls from the same phone all the time you may use "go pinless" option.
Configure your phone number on "TELEPHONY"->"options"->"go pinless & callback" page.
3. Enter your destination number. Country code + phone number. Do NOT enter any international dialing prefix.
For your favorite telephone numbers you may use speed dial. This option should be configured first on "TELEPHONY"->"options"->"speed dial" page.
You may use "*" to interrupt current call and make another call without disconnecting from access number.