Launch IBM installation manager as shown in the screenshot below and add repository.
Note: Click here for IBM Installation Manager installation
Download and extract WAS installer and add repository.config file in the installation manager repository.
Open websphere customization toolbox and create new profile.
Open websphere application server first steps console and check the installation by clicking Installation verification. WAS will be started as part of the Installation verification. If WAS to start/stop navigate to WAS installed directory and start the services.
Start and access WAS admin console and login with admin credentials configured above.
-- Siva Pokuri.