A good video tutorial of basic functions for an abacus have been published on youtube by Lindblå Läs och Skrivutveckling. This is a good starting point for anybody wanting to learn how to use an Abacus to improve their arithmetic skills.
More interesting tutorials in the published series:
Basic function
The exchange method up to 5
Complementary numbers up to 5
The exchange method up to 10
Complementary numbers up to 10
Complementary numbers above 10
Difficult positions on the modern Abacus
Are you giving training to kids in Sweden? If yes Where?
Not us but please check with Lindblå Läs & Skrivutveckling http://www.lindbla.se