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Say what's not working and what error messages you receive.
WhatsApp support will want to know when you're experiencing the issue and if it can be reproduced. For example, you can write, "Why does my screen in WhatsApp video call keep freezing? It's been happening every time I make a video call. How can I fix this?" and then leave your phone number in international format. Another example of an inquiry could be, "My phone keeps telling me I have WhatsApp messages when I don't. It started about a week ago telling me there was one. This is happening every day now. How do I fix this?" Let them know you're looking for messenger support for your specific model of phone or for the desktop app. Don't ask a question that's answered in the FAQ section. Customer support prioritizes reports of issues and will not answer a question that is answered by the FAQ.