Most issues on this repo are requests for new commands. If it's the case, make sure to use the standard title ("page request: <commandname>"), and include a link to a web page about the command, and if possible, to an existing source of example-style documentation.
If your issue is with a particular client of tldr, please raise the issue in the repo for that client. For example, if you are using the node client, you would report the issue here: https://github.com/tldr-pages/tldr-node-client/issues
If you have a general question or are not sure whether to open an issue, please feel free to ask in our Gitter channel: https://gitter.im/tldr-pages/tldr