Vuely have 6 predefined themes which you can see under the src->themes folder:

-themes
 --accentTheme.js            // Accent theme
 --dangerTheme.js            // Danger theme
 --infoTheme.js              // Info theme
 --primaryTheme.js           // Primary theme
 --successTheme.js           // Success theme
 --warningTheme.js           // Warning theme

There is a number assigned to each & every theme in the vuely. You can use this number to update the theme settings of your template. Check about the number assigned to particular theme in the given table:

Open src->store->modules->settings->index.js file to update the theme settings of your project. Search for the selectedTheme key and update the value to theme[Number_Assigned_To_Selected_Theme]

For Example:index.js

const state = {
  ...
  selectedTheme: themes[3],// for danger theme, like wise themes[0] for Primary Theme
  ...
}