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If I had to guess, I'd say you don't have an administrative role. Is this a WordPress you manage? Did originally have Settings and Plugins page then lost them whenever updating something or have you never had access to these two pages on this install?
First of all thanks for your reply. acctually i have adminstrative role. yes this is wordpress but somebody else design this for me but he said this is the only admin account he made but somehow he removed rest of the menu tabs. i don't know how and he don't want to bring them back for me :(
Without knowing how the menu items were removed, it's impossible to help, and without seeing the code, we can't help. Right now this is impossible to answer. I would contact the person who made this for you and ask, they've clearly tried to remove everything that isn't relevant to the theme you're using so it doesn't confuse users
Settings
andPlugins
page then lost them whenever updating something or have you never had access to these two pages on this install?