Welcome to the forum! There are a lot of great people here willing to lend a hand anytime. Often using the Advanced Search box (at the top of every page) will lead you to the answers you're looking for. If not, feel free to post a question in the appropriate area.
Please take a moment to view the information linked below my signature to get the most out of your iPad as well as our forum.
To add a new international keyboard, go to Settings > “General” > “Keyboard" > "International Keyboards" > "Add New Keyboard”. Select the language preference.
To activate it open an app and bring the virtual keyboard up. Tap the international keyboard symbol (small world icon to the left of the space bar). Then, select the preferred language.
With respect to Yahoo Messenger...what is happening, what are you seeing?
Welcome again and enjoy!