Using Expert Advisors
 For EAs working, it is required to download and install MetaTrader 4 software first, then expert was attached to Chart and were enclosed all necessary options, allowing actions of the expert. In operation expert computer must have a constant connection to trade server.
The File by default, where kept experts, which MetaTrader 4 must find at start:
C:\Program Files\MetaTrader 4\experts
Experts in editable form (source code) have an extension mq4.
Example: expert.mq4
Experts in compiled form (source code of expert translated in computer code) - such as OUR files, have an extension ex4.
Example: expert.ex4
 SETUP PROCESS. After you put EA (for example - Expert.ex4) in folder \experts, it will be necessary to re-run MetaTrader 4, therefor that MT has found a new expert. If all of this are done, and it is correct, that expert will come up for list as on drawing:
Hereinafter necessary to attach the expert to chart and in dialogue window to include the necessary options.
The last necessary is to allow trade by pressing on button at MT panel (top-left) :
  If all are done true, up-right corner of chart will appear the symbol of the smile like this.
EAs does NOT run WITHOUT pre-installed MT4 platform. They run ONLY UNDER MT4. For all of your questions, first read the Official MetaTrader User Guides please.
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Strategy Tester is accessible from section "Kind" of the basic menu of MT. On a tester, it is necessary to specify the EA, the Symbol, the Period, to set date, to put a tick in checkbox "Count".
Shortcut "Properties of Expert" allows to change parameters of adjustment of the adviser. The adviser is started on testing by button "Start".
Upon termination of procedure on shortcuts in the bottom of the screen, the detailed Report of testing is accessible. More in detail of the general information on advisors and their testing can be read through in section "Information" of the basic menu of MT.