Compile Abella by running "make" from the root directory. This will create the binary "abella" (on Unix-like systems, including Mac OS X), or "abella.exe" (on Windows). This binary can be freely copied anywhere.
Use the following walkthrough for an introduction to using Abella:
http://abella-prover.org/walkthrough.html
More information on Abella is available at
Please report all bugs, feature requests, and issues on the GitHub issue tracker for Abella, available from:
https://github.com/abella-prover/abella/issues
Discussion of Abella and its uses happens on this mailing list.