Shopify Theme Installation & Minor Customization

I need an expert to install the Kalles Shopify theme on my store and set it up. My store is selling furniture.

Key tasks involve:
- Installing the Kalles Shopify theme
- Minor customizations: Adjusting the color scheme, tweaking the layout, and installing a WhatsApp button

Skills and experience required:
- Proficient in Shopify
- Experience with Kalles theme is a plus
- Good understanding of minor customizations like color adjustments and layout tweaks
- Ability to install a WhatsApp button on the site