1. First, copy the EA(MQL4 format or EX4 file) file you obtained from the Internet to the platform/expert file. If you are running MT4, restart it. 2. Read the instruction manual of EA or the website of EA source to understand the currency pair and time period applicable to this EA. 3. Open the platform, select Tools-Options menu, and check and confirm as shown below. 4. Open the corresponding currency A and drag it to the chart. 5. In the pop-up menu, after setting various EA parameters according to your own requirements, click OK. 6. When the smiling face pattern appears in the upper right corner of the chart, it means that EA is loaded successfully and EA will automatically start working.