Hi, Maddis,
If you are using the RC2 (Release Candidate 2) version, you have most likely missed to install the wxSmith plug-in, because it needs to be manually selected for installation. If it is not installed, it does not appear on the main menu. Anyway, do not use the RC2 version if you intend to use wxSmith, because its wxSmith is substantially old and has missing features as well as issues that have been resolved in newer releases. Rather, download the latest nightly build of CodeBlocks -- wxSmith is included in it, and as it does not have an installer, you cannot miss installing wxSmith.
Cheers,
Vesko