What is the role & responsibility for a QA tester or what is the manual testing process  

Basically a tester has lot of role & responsibility in a testing life cycle, most of them are:

Ø  Study FRD (functional requirement document)

Ø  create LOE

Ø  prepare test plan

Ø  prepare test scenario

Ø  create  test cases, prepare test data, execute test cases

Ø  mapping test cases to the requirement cases

Ø  manage defect, reports defect

Ø  communicate with Test Lead, Test manager, Developer

Ø  successfully collaborate with scrum master & team members

Ø  comfortable with using SQL