XF 1.5 How can we change the WYSIWYG editor to a basic editor?



We got a problem here. When our users use iPhone reach our forum through WeChat integrated browser, they can't post anything because the whole input area just can't reach. It looks like a background picture, can't click on it. After I did some research, I found it is not XF's problem but WeChat because our site works fine if they use safari. We don't want to lose these users came from WeChat so is there any way we can change the editor to basic text input area? Like the title input area.