You can change the template you first chose whenever you want. You won't lose your content or any information you already added to your site.
STEP 1. Go to the template picker
To change your template just click on the Style (1) tab on the left and select Browse templates (2) to go to the template picker.
STEP 2. Select a new template
You will be able to see all the templates included in your account. Click on the template you like the most and you will be able to see a preview
STEP 3. Apply your new template
1. If you like the template you chose, click on Use template to apply it to your site.
2. Remember you can see a preview of the template in all the different devices by clicking on the device icon.
3. If you want to keep browsing through the templates, click on 'All templates'