location of starter solenoid on 2005 Isuzu Ascender

My car just click once when i try to start it. this problem just occured yesterday. It is the first time that i ever encounter this promblem.

Asked by for the 2005 Isuzu Ascender
Start with a fresh battery as trouble shooting a starting problem without a fully charged battery is impossible and if the battery is 3 to 4 years old it could be bad, Batteries are available at autoparts stores, Walmart, Sears, Pep boys etc