Nothing happens here!
This app works in the background and loads automatically when you open the fxDreema EA builder. No other website can work with this app.
When you try to export a file in the fxDreema EA builder, you will see the Save As window first. Then, when you save the file, the app gets a permission to automatically do the same the next time you try to export the same file. You will not see the Save As prompt again for that file.
For this to happen, you need to define the output directory of the files in the setting in fxDreema. For example, the directory for MetaTrader 4 needs to be the same directory that opens when you fo to File -> Open Data Folder - without /MQL4/Experts in the path.