If you halogenate using Br2, you will get a mixture of 5- and 7- halogenation. The nitrogen in the 1-position activates the benzene ring, i.e. ortho-,para-directing, respective to itself. You can select the 5-position by acetylating the 1-position, which provides steric hindrance to protect the 7-position. Alternatively, you can halogenate exculsively the 7-position by selecting a halogenating agent that coordinates with the amine (the reagent escapes me at the moment.)
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