Planets retrograde in a chart (whether 7 or 10 or 1 or 6) means that those planets are operating at half strength. Their power is limited and hindered. Sometimes that is a good thing depending on where they are and which ones they are and what signs and houses they are in.
Retrogrades will be where limitations are, controlled situations. Chances are the planets that are retrograde are going to be Mercury, Saturn, Uranus, Neptune, Pluto, Mars and Jupiter. Those are the ones most often retrograde in charts.
You need to read up on the specific planet that is retrograde and see what is said about it. There is plenty of information on the net regarding this. But pay attention to what you are reading. There are those that write about planets that are currently moving retrograde. You want natal retrogrades. Here's an example of what I am talking about.
Saturn Retrograde
* feels inside that they're never good enough
* indulgent outward behavior may mask inner feelings of inadequacy
* hides fears
Saturn deals with karma, limits, responsibility, tradition, conservatives, authorities, long term goals and accomplishments patiently created, taking responsibility, creating structure, and setting boundaries. Once a year the planet Saturn goes into retrograde for about four-and-a-half months. During this influence, you will probably find it unwise to attempt sudden changes or to rush through things. Take practical steps and accept limitations while you take serious steps toward your long term goals. Saturn retrograde can cause you to become your own hardest taskmaster, limit your actions or leave you feeling blocked and pessimistic.
Saturn retrograde in your natal chart, indicates that you are likely to have been abused by those with power over you, perhaps having faced unfair situations at home. You may need to declare personal boundaries in order to work out conflicts with authority on a karmic scale. You could feel that fate conspires against your desires but it’s really you putting the brakes on through feelings of persecution or inhibition in the house where it is placed until you work out how to face doing or confronting whoever or whatever it is that threatens you. Your lesson is one of patience and steady application of hard work as you overcome the impatient urge to cut corners. Everything you gain will be hard won but you will eventually succeed, win the respect of others and actually can shine where you faced difficulties before.
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Link:
http://www.skyviewzone.com/astrology/retrogradeplanets.htm
Once you have that figured out, go read about the house position and then the sign. Read, learn, understand