Step 3: Double click the downloaded and unzipped file RemoteTap.prefPane to install it. When asked, select “Install for this user only” and click “Install”.
Step 4: In the upcoming RemoteTap pane, click on Enabled. Set your own password and confirm with the Return key.
Step 5: When asked by the OS X Leopard firewall to accept incoming connections, click Allow. If you are still running OS X Tiger, setup the firewall by following the instructions here.
Step 6: Make sure the server status displayed is "Server Running". If an error message is displayed instead, repeat steps 1 to 4.
Step 7: Now take your iPhone and launch the RemoteTap application. Click on the Plus sign at the upper right corner. In the next screen, click on the “Scan” button in the upper right corner. All Mac’s in your local network running RemoteTap will show up. Click on any entry to add it to the host list. Don’t forget to add the same password you used in Step 3. Click on done to go back to the main screen.
NOTE: In case the IP/DNS field only shows “localhost”, replace it with the network name of your Mac, e.g. “Macbook.local”. In case the IP/DNS field shows a name ending with “.net”, replace “.net” with “.local”.
Step 8: At the main screen, click on the new entry just created. The Mac’s display should appear sized to fit the iPhones screen.
NOTE: In case the connection fails even with the iPhone and Mac in the same local network, try using your Mac's IP address (System Preferences, Network, Ethernet or AirPort) as the "IP/DNS" in RemoteTap.