First you will need to install the game on your computer. To so so follow the instructions given in here.

Some software is required prior to run Lbanet. So make sure that you have them installed on your machine before installing Lbanet as it is explained in the instructions.

Once you have installed the game on your machine, you can proceed to starting the game.

If you downloaded the archive version, unpack it somewhere on your machine and start the LBANet.exe to patch the game.
In case of installer version, run both installers then start Lbanet from the windows start menu. This will automatically run the game patcher.

A screen should appear showing the game patcher:

The game patcher is used to get the latest version of Lbanet from the server. It is automatically patching the game. All you need to do is wait for patching completion. You can then click the "Play" button on the screen to start the game.

The game should then start showing you the login page:

Just enter your username and password and press the login button. if you do not have an username yet you can get one by registering here.

Once logged in just select a world and press Enter or Ok button. You will arrive to the game view. Now the fun can start! (for more details on the game gameplay you can have a look at the gameplay videos here)

Troubleshooting:

If the game patcher or the game do not start or crash at startup first have a look at the FAQ section to see if your problem is known here

If you still can not resolve your problem, you can leave a post on the forum here. You should get an answer from the community to help you out.