In order to install Yahoo application on android, it is advisable to open the Google play store on the device further in the search field enter the application name further as you see the yahoo application in the search results then click on install given next to it. If you are still looking for more help then ask for it from the experts. But after clicking the install button you just need to wait for the installation process to complete. Lines are open for help and support all the time there is no such issue that cannot be resolved by the experts.