In order to connect your tablet to other wireless networks, you will need to first be in a location that has a useable WiFi signal.
Next, most networks required some sort of authentication / login. Usually, this means providing correct combination of SSID & a security key (a certain combination of numbers / letters / symbols) that informs the network that you have permission to connect. Generally, this information that is provided to you when you ask how to connect while you are a guest in hotels, restaurants, etc. Some places print the access code on your receipt (and may only allow for a certain amount of access time).
Other wireless networks are "open". This means you can freely connect to them, but will probably have some sort of policy or terms of service (TOS) that you must agree to before you are allowed to browse beyond this page. If you fail to "agree", you can't navigate to another page. This type of access is commonly found at McDonald's restaurants, hospitals, etc.
Once you have the determined the system you're in, you should be able to either connect to an open system, agree to the terms and continue browsing, etc.; or provide the SSID & security key that was provided by the establishment you're visiting, into the network settings of your tablet (and make sure that "Airplane Mode" is OFF) See Page 43
of the manual to learn how to do this.
Realize that when you are on networks such as these described above, they are "Public Networks". There may be dozens or more people accessing the internet on the same network hardware as your tablet. This means that there is a much higher probability of being "hacked" than when connected to your private "Home Network". You should resist the temptation to enter any of the sites that you use that requires you to enter credit card information or a username and password. It is too easy for others to capture this information on the wireless network and use it to their advantage. This includes (but not limited to) email accounts, remote login to company systems, banks and any other financial institution, etc. Be sure to REVIEW what YOU share, too!
I hope this was helpful & good luck!