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In this video we want to find out how we can modify the size of an existing buy position, this one is reduced right now, you see that the position size is changing and we want to find out how to code that in mql4. To do that please click on the little button here or press F4 on your keyboard, now you should see the Metaeditor window and here you want to click on file, new, expert advisor from template, continue, I will call this file simple buy position modify, click on continue, continue and finish. Now you can delete everything above the on tick function and we also delete the two comment lines here. Inside of the on tick function we want to check if we have no open orders, that would be the case when the return value for the function orders total is below one and if that is the case we want to open a test position. You wouldnt do that on your real account but we need to open a position here so we have something that we can modify later on, so we use the order send function to open
