simple arduino code

I have no coding skills, and need help with a basic arduino project. I want to get a Wemos D1 to actuate a servo via an Alexa command. The essence of the project is to get it to open and close a door latch. I've got 95% of the code working, I'm just stuck on getting the servo to move in the proper directions with the proper commands, and I want to modify the commands if possible. Here is the site where I got the code that needs modification: [login to view URL] Currently, the code will make the servo go back and forth as per the original project design. I have that working on my Wemos and I'm able to activate it with Alexa. Help me get the last bit done - probably would take someone who knows what they are doing just a bit of time. Thanks!