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how can u make an image place exactly in the spot you want it?

Hello,
im a latex newbie...and have an assignment in latex due tommorow.
i have inserted graphics in eps format into my latex.
the latex is compiling correctly.
i can view it using the built in dvi viewer.
however the problem is that where there should be images there are just empty spaces.
and for ...

hello!
new to latex!
nice to meet you all!
- maryam.