To enable autocomplete of commands, you will need to source the appropriate file in the .autocomplete folder. As an example, if you are using bash, you will have to source the .autocomplete/bash_autocomplete. If you are using zsh, you will source .autocomplete/zsh_autocomplete. You can setup this in a place where it will get automatically sourced (usually /etc/bash_completion.d/dr), or you can copy the file to somewhere else and source it manually (in your .zshr for example).
As an example, we could have in our ~/.zsh:
source ~/.autocomplete/zsh_autocompleteObviously, you can change the name of the file to something more descriptive (e.g: from *zsh_autocomplete to dr_autocomplete).