Ubuntu Installation :: Add A New Compiler To Be Used In Bash?

we are using a tool to simulate a basic computer, called TOY now this TOY has its own compiler and linker, which i will need to use in order to use *.asm files in this simulator how do i add the commands "toyasm" and "toylink" to be used in my linux bash? i have the files "toyasm" and "toylink" provided by the lecture's materials, and already managed to copy them into /usr/bin, where i found the "gcc" compile command already (been using that one before) but now i get "permission denied" when i try to use the new ones. what to do when i want to add custom compilers to my system?