How do I assemble my SC 3 Upright EasyFix steam mop_ _ Kärcher UK

The Kärcher SC 3 Upright EasyFix steam mop is Kärcher’s best performing steam mop and is ready to use in just 30 seconds, removing 99.999% of enveloped viruses* and killing 99.99% of common household bacteria** using nothing but tap water. The SC 3 upright has 3 predefined floor settings and the LED lights indicate when the machine is ready for use ensuring the perfect amount of steam is allocated as well as delivering continuous steam. The integrated descaling cartridge continuously prevents the build-up of limescale; and because Kärcher steam kills 99.99% of bacteria**, its ideal for allergy sufferers.