A timeslot is relatively easy to explain. It divides the digital transmission on the frequency in two channels, named TS1 and TS2. Analog communication can only do one communication on a channel at a time. In DMR two conversations can happen at the same time as the digital packets need less “space” (see graphic below). Depending on the setup of your repeater you will have i.e. static TG’s in TS1 and dynamic TG’s in TS2. Which are static and which are dynamic depends on the sysop and recommendation of i.e. the Brandmeister community. If you want to use a specific TG, simply select the TS2, the TG you want and press PTT for a short time. Depending on the time-out value the repeater sysop has set, you are now in this TG dynamically and without any activity of you (i.e. a QSO), this dynamic TG will be removed after 6-10 mins.
Same with color code. The color code you have set for a digital repeater in the Channels.csv must correspond with the color code this repeater uses. Most repeaters use color code (CC) 1.You will find the CC’s typicallly in the repeater lists in the internet for your region, state or country. Here is a worldwide repeater list as an example I have created, which covers all Brandmeister repeaters worldwide. Due to inconsistencies in the database I dumped the records from, I am pretty sure it is not complete, but it is a start for you. Keep in mind that if a repeater works on multiple frequencies, it can not have the same name for both frequencies, you have to modify such an entry.
In the above graphic the 12.5 kHz Bandwidth of a channel is subdivided into 2 TS’s. DMR Radio one and three use TS1 and DMR Radio two and four are using TS2 simultaneous on one channel frequency without disturbing each other.