1. Need to checkout the current version to the project directory:
$ svn co http://wiki.syktsu.ru/svn/project_name .
/* Dot points to the current folder. */

2. Now check that directory contain .svn folder
$ ls -a

3. There are some useful commands
$ svn st
/* It shows your files statuses */

$ svn add source1.c header2.h
/* Add files to the version control system */

$ svn --username=user_name ci
/* Commit changes, username and password can be specified only once at the first
commit, password and user will be stored in ~/.svn folder, and later you can use
only `svn ci' */