Which theme you are using ?
Ok. So you might be having theme.liquid or index.liquid in your theme there you can insert the tag.
Yes exactly because as per your question you said that "I can`t find where I can write H1 for my main page" so you need to do that.
As the theme is developed by your developer so its easy to make the changes.
You want to remove lazy load??
If yes then you can just remove data-src and can remove the lazyload.
Without access to your code I can't suggest much because as its a customized theme so i don't have any idea the protocol used.
|an hour ago|