Insert in MongoLab (mongo shell) remotely - my PC is win 7 64bit but stuck in this error below

[lsepolis123]

Inserting New Data in p. 93 of the book by Sitepoint MEAN Stack
FULL STACK JAVASCRIPT DEVELOPMENT WITH MEAN BY ADAM BRETZ
insert in MongoLab (mongo shell) remotely - my PC is win 7 64bit but stuck in this error below… can you debug error - shell error?

rs-ds031611:PRIMARY> db
presidents
rs-ds031611:PRIMARY> db.people.insert({name: 'Bill Clinton'})
WriteResult({
        "writeError" : {
                "code" : 13,
                "errmsg" : "not authorized on presidents to execute command { in
sert: \"people\", documents: [ { _id: ObjectId('54ba7e9d271d775ad2e1b638'), name
: \"Bill Clinton\" } ], ordered: true }"
        }
})
rs-ds031611:PRIMARY>

[lsepolis123]

problen solved - was using git shell

switched to CLI WINDOWS AS ADMIN and worked…!!!

Qs

1. deleting a collection deletes all databases in it? in other words databases are inside collections in mongodb?
2. how run git shell in win 7 as admin?

errata

book mentioned here : missing source code for ch.9 mongo in book’s app.