Kahuna CLU-Bass Ukulele : great instrument for the price

I am very pleased with my ubass. I was really surprised how good it sounds. I bought it for home use but it is probable good enough for some gigs too. The only issue is with exchanging strings: I bought pyramid strings and wanted to replace original rubber strings but there is absolutely no info how to do it properly on this model. When I asked support team for advice I only got a suggestion to do it via acoustic hole but no details at all. There is no plate at the back to get inside. So this lack of instruction is very disappointing - but I will not deduct stars this time because I really like this Harley Benton Kahuna CLU-Bass Ukulele and I think it is great for the price. Fortunately, original strings play surprisingly well so I will give them some time. I hope I will find the way how to change them properly one day.