Hi @sagar23,
In order to add slider please follow below instructions
1. Create a post, give title and description and set featured image.
2. If you want to add more slides in the slider, create more post (like if you want add three slides in the slider than you have to create three post and set feature image for them).
3. Now go to customizer >> Awada options >> Slider options
4. select all posts that you create for the slider (In the multi select box).
q. For your second query to add search box in top right side?
ans. Yes, you can do that. but it can take place of social icons.
for this you have to create a child theme. follow below link to create a child theme
https://demo.webhuntinfotech.com/blog/2016/01/11/how-to-create-a-child-theme/
there is two methods to create a child theme you can follow any of method.
Don’t forget to tell us which method you are used to create child theme and also provide your site URL for batter support.
Thank You
