If we want to filter messages only to **female members**, we need to collect this information at the start of the membership registration process.
This means members must provide the relevant information, such as **gender**, when they sign up for membership.
In the example shown here, we are filtering by **Lead Source**. During the testing period, all testing mobile numbers are tagged with the Lead Source **“Testing”**. As a result, only those numbers will receive the testing message.