I don't know the answer (never even touched codeblocks, and assimp only one time), but in general people here are busy, and writing step-by-step instructions is a lot of work.
It's much more efficient if you show what you tried, and where you get stuck. Explain in details what fails (including the actual error message, it may mean not much to you, but someone with experience can derive a great deal of information from it, in general). Also explain what you expected to happen, and if possible, what did you try (and with what result) to fix the problem?
Ie make it as simple as possible for someone who knows to give you an answer that allows you to get going again.
Did you try in a codeblocks forum by the way? People here use lots of different software, and only a few use codeblocks. A forum about codeblocks is much more likely to give you assistance, as literally everybody there knows at least about codeblocks.