How do you save a dictionary (table terms) into a data store then get information out later?

Here is my code (I'm testing):

local information = {
    User = {
        ["UserName"] = "EncodedLua",
        ["Membership"] = "OBC"
    }
}
local master_dictionary = {

}

table.insert(master_dictionary, information)

for i, v in ipairs(master_dictionary) do -- What do all do I do in this for loop? I know that you have to use a for loop somewhere in the process.
end