CHEMISTRY COMMUNITY

I'm not exactly sure about your question. In general, though, indicators should be as close as possible to the expected equivalence point of a given titration. For example, we would use an indicator that changes color between pH 4.6-5.1 for a titration with an expected equivalence point around pH = 8.

I had trouble particularly understanding the relationship with the indicator and pH

First, the understanding of indicators is applied more in 14BL. Indicators are used to find the equivalence point in titrations, which are experimentally found. Also, because pretty much the only thing about weak acids and bases that we cover in 14A is they do not fully dissociate, and because we cover strong acids and bases which have an equivalence point of 7, so an indicator with strong acids and bases is not that useful.