Linking DLL to project doesn't work - c++

Question

I created a DLL project called Test Lib:
// main.h
#ifndef __MAIN_H__
#define __MAIN_H__
#ifdef BUILD_DLL
#define DLL_EXPORT __declspec(dllexport)
#else
#define DLL_EXPORT __declspec(dllimport)
#endif
extern "C" {
DLL_EXPORT void print();
}
#endif
// main.cpp
#define BUILD_DLL
#include "main.h"
#include <iostream>
using std::cout;
using std::endl;
extern "C" {
DLL_EXPORT void print() {
cout << "Success" << endl;
return;
}
}
The library builds successfuly, and I then created a console project called TestApp:
// main.cpp
#include <main.h>
int main() {
print();
return 0;
}
Test Lib and TestApp folders are both in C:\Documents and Settings\user\Desktop\Practice Projects
On Code::Blocks -> Global compiler settings -> Search directories,
Compiler has added C:\Documents and Settings\user\Desktop\Practice Projects\Test Lib
Linker has added C:\Documents and Settings\user\Desktop\Practice Projects\Test Lib\bin\Debug
In TestApp -> Build options -> Linker settings, Link libraries has added Linker has added C:\Documents and Settings\user\Desktop\Practice Projects\Test Lib\bin\Debug\libTest Lib.dll.a
When I try to run the program, I get "TestApp.exe - Unable to Locate Component"
This application has failed to start because Test Lib.dll was not found. Re-installing the application may fix this problem.
main() returns 0xC0000135. This is the second DLL library I have ever created, and is because I encountered the same error in my first library and I am trying to replicate the error.
In one attempt, I tried to change the .dll.a link to a relative path. In another attempt, I moved the compiler and linker directories down to project-level rather than global level, all three paths in absolute format. In a third attempt, I did the same but with all three paths in relative format. None of these work, and give the same error.
What's going wrong?
Edit: Someone said in comments I need to add the DLL path to system settings. I don't understand what I need to do when he says that. I was following this tutorial on creating and using DLL, which says I needed to add the .lib and .dll to the project path, which is what I did as described above after doing more searching (Code::Blocks isn't my usual IDE, my employer gave it to me for temporary use). When I created my first DLL 2 days ago, that was all I did and everything worked. Then, I added a new function for checking if an integer is a prime. Yesterday morning, I came back to work and the DLL doesn't work anymore. I have been trying to figure out the problem until now, because I had not done anything to cause it to stop working (I literally only added the function, turned the computer, left work and returned the next day, then rebuild the DLL project and ran the console app project). Now, I tried searching on how to add a DLL path to system settings, and I don't see any results relevant to C++ and/or Code::Blocks that looks like the answer. Can someone tell me what I'm supposed to be looking for?