Hummingbird questions

On https://preachnet.com/wp-admin/admin.php?page=wphb-performance it says this:

BENCHMARKS

Leverage browser caching for the following cacheable resources:

https://preachnet.com/wp-content/plugins/arscode-ninja-popups/themes/animate.min.css (expiration not specified)

https://preachnet.com/wp-content/plugins/arscode-ninja-popups/themes/reset-builder.css (expiration not specified)

https://preachnet.com/wp-content/themes/bb-theme-child/style.css (expiration not specified)

https://preachnet.com/wp-content/themes/bb-theme/css/bootstrap.min.css (expiration not specified)

https://preachnet.com/wp-content/uploads/2016/05/color19.png (expiration not specified)

https://preachnet.com/wp-content/uploads/2016/05/geek-plus-church-equals.png (expiration not specified)

https://preachnet.com/wp-content/uploads/2016/05/type-away-numero-dos.jpg (expiration not specified)

https://preachnet.com/wp-content/uploads/bb-plugin/cache/cartoon-tech-geek-circle.jpg (expiration not specified)

https://preachnet.com/wp-content/uploads/bb-plugin/cache/church-image-circle.jpg (expiration not specified)

https://preachnet.com/wp-content/uploads/bb-theme/skin-5742217dc2079.css (expiration not specified)

https://preachnet.com/wp-content/uploads/ninja-popups/bg80.jpg (expiration not specified)

https://preachnet.com/wp-content/uploads/ninja-popups/close_7e.png (expiration not specified)

https://www.google-analytics.com/analytics.js (2 hours)

In .htacces I have this:

## LEVERAGE BROWSER CACHING ##
<IfModule mod_expires.c>
ExpiresActive On
ExpiresByType image/jpg "access 1 year"
ExpiresByType image/jpeg "access 1 year"
ExpiresByType image/gif "access 1 year"
ExpiresByType image/png "access 1 year"
ExpiresByType text/css "access 1 month"
ExpiresByType application/pdf "access 1 month"
ExpiresByType application/x-javascript "access 1 month"
ExpiresByType application/javascript "access 1 month"
ExpiresByType application/x-shockwave-flash "access 1 month"
ExpiresByType image/x-icon "access 1 year"
ExpiresDefault "access 1 month"
</IfModule>
## LEVERAGE BROWSER CACHING ##

I just got that code from a wp forum post, and I actually had it in there before I installed hummingbird. So how do I add the items to browser caching that hummingbird says are a problem?