In general on "linpus light" you can not install software .
the manufacture , for some unknown and idiotic reason, thinks that no one would want to install anything on it .
you will need to do a larg amount of learning .
Start with the aspireoneuser forum
but most people DO NOT consider Linpus light to be a real OS
( most peg it as the #1 worsted or DEAD LAST in the top 1,000,000 list .)
installing Ubuntu or MintLinux is often the best option .